Welcome to Catholic Answers Forums, or CAF as we often call this place.
This is a huge site, and a bit overwhelming at first. One section you might be interested in exploring is called Mini-Tutorials
. It is sort of a Frequently Asked Questions list. It can be found in the section called Concierge Desk
The answers to your questions can be found there. But to save you some digging, here are the answers
CAF's software will automatically bestow on us a membership title. This title is based upon two things: the length of time we have belonged to CAF, and the number of posts we have made.
Presently, you are considered a Trial Member. Unfortunately, this means you don't yet have the ability to create a signature or post graphics. Those privileges will be unlocked when you reach the status of New Member, which is roughly around three weeks of membership AND having made at least 15 posts. You can find more information about the various membership titles at this link
Uploading your own custom avatar.... will take longer.
That privilege is unlocked when you become a Regular Member, which occurs after belonging to CAF for six months AND having made at least 500 posts.
However, you will be able to choose from CAF's stock avatars once you become a Trial Member, which is much, much sooner.
More information about avatar permissions can be found at this link
I hope you find that information helpful, even if it is a bit disappointing.